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characteristics of many populations were associated with high within-population genetic similarity suggesting that narrow genetic variation in some populations may be contributing to lack of sexual reproduction in the wild ( Porter et al., 2012 ). The combination

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three to five with slender styles; stamens usually number five per flower. Anthesis occurs in late April to May. Little research has been published on Z. americanum in general and even less so on its sexual reproduction. Although there has been some

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cross C. japonica × C. mollis Sieb. et Zucc. and its fertility was confirmed by pollen staining and seed germination of the F 1 as well as successful back-crossing to C. japonica ( Tsukaya et al., 2003 ). These results indicate that sexual

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event in plant sexual reproduction and has become an important topic in studies on plant embryology. Since the first report describing double fertilization, great progress has been made in many studies. For the study of male and female germ units, the

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, 1967 ). In flowering plants, calcium plays crucial roles in regulating sexual reproduction processes such as pollen germination, pollen tube growth ( Cardenas et al., 2008 ; Franklin-Tong, 1999 ; Hepler, 1997 ; Heslop-Harrison, 1987 ; Kwack, 1967

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topic. The final chapters on vegetative growth and development; sexual reproduction, grain yield and grain quality; and the biotic environment take a more holistic look at the influence of the environmental factors on crop productivity. In each chapter

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progenies coming from the fruit of an ‘Early Rose’ plant reinforced his philosophy about revealing genetic variation. The variation accumulated over many generations of sexual reproduction was hidden only to be unfettered by hybridization. “We have observed

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plant propagation, information on the organization of the book, and essential information to help build a foundation on plant science including botany, plant physiology, plant growth regulators, sexual reproduction, and plant breeding and genetics. Parts

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demonstrated a history of sexual recombination in the populations under study ( Douhan et al., 2002 ). Although sexual reproduction has been observed infrequently or not at all in many members of the Ascomycota, recent genetic studies have revealed

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lower rate than sexual reproduction (Phillips, unpublished data). It is common for the mating system of a species to play a critical role in the patterns of genetic diversity within and among populations, but the dominant nature of AFLP markers does not

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